The FIR spectra of benzamide, acrylamide, caprolactam, salicylamide and sulfanilamide, after automatic baseline correction shown in Figure 3 indicate that the five molecules have different band positions and relative band intensities.
Sulfanilamide has the bands located at 641, 626, 563, 541, 497, 450, 414, 365, 302, 224, 132, 88, 72, and 58 [cm.sup.-1] in its FIR spectrum.
Sulfanilamide has two strong bands located at 563 and 541 [cm.sup.-1], and the band at 365 [cm.sup.-1] is relatively strong, and other bands are weak.
Fortunately, there are some calculation results for benzamide, salicylamide, and sulfanilamide .
For example, in the calculation results, the main absorption bands of sulfanilamide below 100 [cm.sup.-1] are centered at 15 and 85 [cm.sup.-1].
Philip, "Vibrational spectroscopic studies and ab initio calculations of sulfanilamide," Spectrochimica Acta Part A, vol.
Topacli, "Semi-empirical infrared spectra simulations of metal complexes of sulfanilamide," Journal of Molecular Structure, vol.